urapnis

I have a 94 S500 coupe. This light started coming on and off the last few days. How does this warning light exactly work? How does it sense that the pads are worn? Is there a sensor of some sort on the pads?
And for this function to work correctly, do I have to use OEM pads or can I use aftermarket?

Thanks in advance.

GrepAwk

When the pad material wears down, the sensor starts to scrape on the rotor, breaks, and the warning light comes on in your dash. There might only be one sensor to indicate for sides of the fronts, and only one for the rear.

There are aftermarket pads with included sensors for some cars. I'm not sure about yours. Just ask. Most parts guys know to sell you a sensor with the kit.

Changed my BMW pads (OEM) and it came with a new sensor. Bought some aftermarkets for next swap out, and had to buy the new sensor from BMW ($4.00?). It's pretty easy to change. Unplug old sensor, Pull off old pads.
Insert new sensor in appropriate niche in the new brake pad (might have a small pin or rivet to hold it in place), and mount new pads. Don't forget to plug in the new sensor.

urapnis

Thanks for the info.
Do I need new sensors then as well or will the ones already installed work?

redcoupe

Yes, you will need new sensors.
I would defenitly go with MB brake pads and some new rotors if needed.

Kestas

I was able to salvage all 4 sensors from my old pads (why throw away good parts?). It takes just a bit of finesse to extract them from the old pads. They are somewhat brittle, the material appears to be similar to electric motor brushes.

charliev68

it's two dollars each! why put a worn out part back inn when you could easily get new ones. it's like changing your clothes without changing your socks and underwear.

Kestas

What wear? These aren't moving parts, nor do they corrode. It's no different than using the same ignition wires when changing your plugs, or reusing the shims behind the brake pad. I changed my pads before the sensors were affected.

Socks and underwear is a poor analogy and a poor argument. You still haven't given me a good reason why one needs new sensors, unless they're broken or have seen appreciable wear.

csumt76

If the sensor is worn into the rotor.... it will have less material on it and will come on at a later point once the new pads become worn..... Just buy new ones and put them on cheapass!!!

ronald7410

Does anyone know where to get these pads and sensors? a website perhaps?